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Finding the Fourth Proportional to 934.38, 1,290.21 and 636.26

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Solution

The fourth proportional to 934.38, 1,290.21 and 636.26 is: 878.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.38 : 1,290.21 = 636.26 : x
  2. Step 2: Convert to fraction form
    934.38/1,290.21 = 636.26/x
  3. Step 3: Cross multiply
    934.38x = 1,290.21 × 636.26
  4. Step 4: Simplify right side
    934.38x = 820,902.56
  5. Step 5: Solve for x
    x = 820,902.56/934.38
  6. Step 6: Final answer
    x = 878.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.